Looking to compete the Blackjack Enduro Circuit in Arkansas this spring. http://www.blackjackenduro.com/Default.aspx I'll be running my 2001 YZ-250. Engine is stock except for Wiseco piston. Running a JD jet kit - 48/172. I've been running the stock pipe and muffler since I got the bike 2 years ago, but they require a USFS-approved spark-arrester muffler, and my stock pipe is pretty banged up. So I'm in the market for a pipe/silencer. The riding in Arkansas is mostly tight, hilly 1-track, with some semi-fast sections thrown in. I run stock gearing (14/50). This gearing is pretty good for the type of riding I do, and I'm using 3rd gear most of the time, clicking into 2nd for little hill-climbs, etc. Rarely use 1st gear. So, I'm thinking about going a little taller on the gearing so I can use 1st and 2nd more, plus allow the bike to be a little more relaxed when traversing fire roads, etc. Maybe a 14/48, or even 15/50 (if a 15T front will fit...anybody know?). Anyway, I have enjoyed the stock pipe/silencer. I think it has a pretty good combination of low/mid/top-end, but I think I might like a bit more low/mid (who doesn't, right!). I've always liked the look of the Pro Circuit stuff. I was wondering who here has used Pro Circuit pipes and FMF pipes both? How did they compare to one another? FMF Gnarly vs. Fatty vs. Pro Circuit? Short silencer vs. long? Any information is appreciated. Thanks.